Regarding Mossberg Suing Manufacturers of Drop-In Triggers (allegedly at the request of CMC), CMC Triggers have released a statement:

CMC Triggers is a Christian company, privately held and not owned by O.F. Mossberg or anyone else.
We pay our bills when they’re due including our royalty responsibility to O.F. Mossberg.

Fair competition in the market place is only fair if the playing field is level.

We proudly stand with them in their pursuit of what is right in regard to all the companies that infringe on their Patent.
Shame on anyone that would spin negatively O.F. Mossberg exercising their right under law to collect royalties.

Jack R Biegel, Pres. CMC Triggers Corp.

UPDATE: Read more about the Patent situation here:

BREAKING: The Truth Behind Drop-in AR-15 Triggers. They Date Back to 1998.